P0394Camshaft Position Sensor B Circuit Intermittent Bank 2
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Camshaft position sensor B is the exhaust camshaft sensor; bank 2 is the side without cylinder 1, so the code only occurs on V and boxer engines with one exhaust cam sensor per bank. P0394 means the bank 2 exhaust cam signal now and then appears at a position where it is not expected relative to the crank reference – sporadic extra or missing edges. Ford checks this in its camshaft ignition system test from 200 rpm and decides within 5 s. FCA also uses the code and asks dealers to save the cam/crank synchronisation event data before replacing parts, a hint that the sensor itself is often not the culprit. GM does not use P0394 and reports such faults under P0391. Typical causes are a loose contact, interference or a damaged tone wheel.
- What you may notice
- Check engine light on
- Sporadic jerking or stalling
- Occasionally longer cranking
- Likely causes
- LikelyLoose contact or corrosion at the sensor connector or harness
- PossibleInterference (ignition wiring, add-on devices, ground problems)
- PossibleTone wheel or phaser damaged, or sensor loose
- PossibleSensor faulty, temperature-dependent
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €40 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.